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Current Electricity

Current Electricity
The maximum current rating for a 10 kΩ, 0.5 W resistor is

28.28 mA
0.707 mA
14.14 mA
7.07 mA

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Current Electricity
All good conductors have high

Thermal conductivity
Reluctance
Conductance
Resistance

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Current Electricity
Electrical current is due to the flow of

Neutral particles only
Both positive and negative charges
Negative charges only
Positive charges only

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Current Electricity
With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals

40 W
10 W
20 W
60 W

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Current Electricity
If the efficiency of a machine is to be high, what should be low?

Losses
Input power
kWh consumed
True component of power

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Current Electricity
A copper wire has a resistance of 10 Ω. It is stretched by one-tenth of its original length. Then its resistance will be

9 Ω
10 Ω
12.1 Ω
11 Ω

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